A large neutral fraction of cosmic hydrogen a billion years after the big bang
Article Abstract:
The fraction of ionized hydrogen left over from the big bang provides evidence for the time of formation of the first stars and quasar black holes in the early universe. About one billion years after the big bang, the spectra of the two most distant known quasars indicates that hydrogen in the intergalactic medium (IGM) had not been completely ionized at a red shift of z approximately equal to 6.3.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2004
User Contributions:
Comment about this article or add new information about this topic:
The formation of the first low-mass stars from gas with low carbon and oxygen abundances
Article Abstract:
Study reveals that as soon as the primordial gas left over from the big bang, is enriched by elements ejected from supernovae to a carbon or oxygen abundance as small as 0.001-0.1 percent of that found in the Sun, cooling by singly ionized carbon or neutral oxygen can lead to the formation of low mass stars by allowing cloud fragmentation to smaller clumps.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2003
User Contributions:
Comment about this article or add new information about this topic:
Suppression of dwarf galaxy formation by cosmic reionization
Article Abstract:
Theoretical simulations claim predict that the formation of dwarf galaxies should have suppressed after cosmic hydrogen was reionized. It is believed that the future surveys with space-based infrared telescopes will detect a population of smaller galaxies that reionized the Universe at an earlier time, before the epoch of dwarf galaxy suppression.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2006
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: The rapid formation of a large rotating disk galaxy three billion years after the Big Bang. Rapid X-ray flaring from the supermassive black hole at the Galactic Centre
- Abstracts: A hobbit-forming image. Luminet's illuminations: cosmological modelling and the art of intuition. The art of rigorous change
- Abstracts: Targeted dehydration of TOC1 by ZTL modulates circadian function in Arabidopsis thaliana. Functional interaction of phytochrome B and cryptochrome 2
- Abstracts: Mechanical twisting of a guest by a photoresponsive host. The gift of healing. Chaperonin-mediated stabilization and ATP-triggered release of semiconductor nanoparticles
- Abstracts: One man's trash. Winds of change blow away the cobwebs on campus. Dispute over data privacy halts cancer study